Automatic alarm mechanism.



No. 851.915. PATBNTEDAPR. 30, 1907.

G. BREILAND.

AUTOMATIC ALARM MECHANISM. APPLICATION FILED MAR. 27, 1906.

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CHRISTIAN BREILAND, OF BELLINGHAM, WASHINGTON.

AUTOMATIC ALARM MECHANISM.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed March 2'7, 1906. Serial No. 308,339.

T0 at whom, it may concern:

Be it known that I, CHRISTIAN BREILAND, a citizen of the United States, residing at Bellingham, in the county of Whatcom and State of Washington, have invented certain new and useful Improvements in Automatic Alarm Mechanism, of which the following is a specification.

The object of my invention is an improved automatic signal mechanism for doors or any other closures, which will provide for the ac tuation of an audible signal when the door knob or similar unlatching device is turned or operated for the purpose of opening the closure, thereby calling attention to the fact that the door or similar closure is about to be opened.

In the present embodiment of the invention the same is shown applied to a door and particularly to a turn knob or handle thereof, so that whenever the door knob is turned a gong or similar alarm will be sounded automatically.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting theresult reference is to be had to the following description and ac companying drawings, in which:

Figure 1 1s a front elevation of a portion of door with my improved alarm mechanism applied. Fig. 2 is a vertical section taken through the bell or gong. Fig. 3 is a similar view, the section being taken approximately in line with the knob. Fig. 4 is a view similar to Fig. 1 but showing the parts in a different position in both full and dotted lines. Fig. 5 is a detail perspective view of some of the parts detached or separated from each other. Fig. 6 is a detail sectional view of the spring pressed slide and its casing.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawings the numeral 1 designates a door knob which may be of any desired construction or design, and 2 designates the axis of the door knob operatively connected to the latch 3, in any desired man ner. To the shank or axis 2 of the knob 1 there is secured an arm 4 which in the present instance is provided at its upper end with a collar 4 by which it is received on the said shank being held thereon at the proper axial adjustment by means of a set screw 5 or the like. The arm 4 is provided with a longitudinally extending series of holes 6 in any one of which a stud 7 may be received to hold one end of an actuating rod or bar 8 in proper relation to the arm 4. It is manifest that the actuating rod or bar 8 may be raised or lowered' at one end by means of the studs 7 and the series of holes 6 so as to be held in different positions to the arm 4.

9 designates the bell mechanism which may be of any desired design and which in the present instance includes as one of its actuating elements a pinion 10. The actuating rod 8 is provided at one end and along one edge with a series of teeth 11, constituting a rack designed to engage with the pinion 10. The said actuating rod 8 is also provided at said end with a longitudinal slot 12 accommodating a pin 13 carried by a vertical adjusting slide 14, designed to carry the slotted and toothed end of the rod 8 into and out of engagement with the pinion 10. The slide 14 is mounted. and guided in a bearing 15 which is provided with an upper and lower socket 16, and the slide 14 is provided with a stud 17 and is designed to be pressed outwardly by a spring 18 so that the said stud or protuberance 17 will enter either the upper or lower socket 16 and thereby automatically hold the toothed end of the rod out of or in engagement with the pinion 10. Preferably the upper end of the slide 14 is bent outwardly to constitute a finger piece 14. The lower end of the slide 14 may be bifurcated as shown at 15) said end embracing the stud or shaft upon which the pinion 10 is mounted and thereby being guided by said shaft.

In the practical operation of my improvement, it is obvious that when a person turns the door knob 1 to effect the disengagement of the latch from its keeper preparatory to opening the door or other closure, the arm 4 will swing in one direction or the other and thereby effect a longitudinal movement of the actuating rod 8, which will in turn rotate the pinion 10 through the instrumentality of the rack 11 and sound the alarm. If it be desired to hold the parts in an inoperative relation, it is only necessary to pull the slide 14 upwardly so that its stud or protuberance 17 will rest in the uppermost socket 16 of the bearing 15, and this will result in the stud 14 carrying the toothed end of the actuating rod out of engagement with the pinion 10, and in maintaining it in an elevated position where the longitudinal movement of said rod effected through the turning of the door knob will merely cause said rod to move back and forth Without any effect upon the alarm mechanism.

As has been before described, the actuating rod 8 may be raised or lowered at the end Where it is attached to the arm 4 either for the purpose of adjusting its position, or for the purpose of giving it a long or short sweep with relation to the turning movement of the door knob so as to ring the alarm more or less violently.

From the. foregoing, description in connection with the accompanying drawings it will be seen that I have provided improved automatic means whereby an alarm may be sounded at once upon the turning of a door knob or similar device to unlatch a closure preparatory to opening the same.

Having thus described the invention what is claimed as new is:

1. The combination with a closure, its latch, and its unlatching device, of an alarm mechanism, an arm arranged for attachment to the shaft of the unlatching device and adapted to have a swinging movement when said shaft is turned, an actuating rod pivotally connected at one end to said arm and arranged to have a longitudinal reciprocating movement, means whereby such movement of the rod will actuate the alarm, a vertically adjustable support on which the last named end of the actuating rod is mounted to slide, and means for holding said support at difierent elevations, as and for the purpose set forth.

2. A device of the character described, comprising an alarm mechanism, an actuating rod designed to be moved longitudinally to operate the alarm and provided with a longitudinal slot, means for connecting said actuating rod to an unlatching device whereby the actuation of the unlatching device will move said rod longitudinally, and a slide provided with a pin received in the slot of the actuating rod, said slide being arranged to be held at different elevations whereby to carry the actuating rod into and out of operative relation to the alarm mechanism.

3. A device of the character described, comprising an alarm mechanism including a pinion, an actuating rod arranged for operation by an unlatching device and provided with a rack designed to engage with said pinion and also provided with a longitudinal slot, a slide provided with a stud working in said slot, and means for adjusting said slide whereby to hold the rack out of or in engagement with said pinion.

d. A device of the character described, comprising an alarm mechanism including a pinion, an actuating rod arranged for operation by an unlatching device and provided with a rack designed to engage with said pinion and also provided with a longitudinal slot, a slide provided with a stud working in said slot, and a guiding bearing for said slot, said bearing being provided with upper and lower sockets, the slide being formed with a protuberance, and spring pressed in a direction for said protuberance to enter either the upper or the lower socket in the bearing, whereby the rack will be held out of or in engagement with said pinion.

In testimony whereof I affix my signature in presence of two witnesses.

CHRISTIAN BREILAND.

Witnesses W. A. McLEoD, CHARLES W. SUTTON. 

